a) ( ) A wave that propagates from left to right has the shape given in picture below. In this case, it is correct to state that the wavelength of this wave is 4d. b) ( ) The speed of sound waves in a fluid, are such that the less compressible is the fluid the greater the velocity of sound propagation in the fluid. c) ( ) With certain musical notes, issued by means of a violin, it is possible cracking, at a distance, a thin blade of crystal. The phenomenon that best explains this fact is the beat. d) ( ) Two sound pulses that start at the same time travel in a straight line on the same direction traveling a distance L in the same gas. The only difference among them is that one follows the path L in a region where the gas is hotter than than the other. Then the one who travels the route L through the coldest region will arrive last on the other side. e) ( ) A sound source S approaching a detector D (at rest) with speed vs , emits sound waves in all directions with a frequency itself fS. In this case, it is correct to state that the frequency measured by D will be lower than fS. Assume that the air is at rest relative to detector D.
Judge the statements below in true (T) or false (F):
two)
a) ( ) A wave that propagates from left to right has the shape given in
picture below. In this case, it is correct to state that the wavelength of this wave is 4d.
b) ( ) The speed of sound waves in a fluid, are such that the less
compressible is the fluid the greater the velocity of sound propagation in the fluid.
c) ( ) With certain musical notes, issued by means of a violin, it is possible
cracking, at a distance, a thin blade of crystal. The phenomenon that best explains this
fact is the beat.
d) ( ) Two sound pulses that start at the same time travel in a straight line on the
same direction traveling a distance L in the same gas. The only difference
among them is that one follows the path L in a region where the gas is hotter than
than the other. Then the one who travels the route L through the coldest region will arrive
last on the other side.
e) ( ) A sound source S approaching a detector D (at rest) with
speed vs
, emits sound waves in all directions with a frequency
itself fS. In this case, it is correct to state that the frequency measured by D will be lower
than fS. Assume that the air is at rest relative to detector D.
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